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GAISER TOOL COMPANY

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GAISER SMALL WIRE WEDGE INFORMATION   

3. BOND FOOT

The bond foot area of the wedge consists of the front radius (FR) bond length (BL), back radius (BR) and width (W). The bond foot design effects the strength and reliability of the bonded wire by changing the impression on the wire. The bond foot determines the coupling between the tool/wire interface,

if the tool fits into the bonding space, and if the deformed wire fits the bonding pad. The bond foot may be flat or concave. Gaiser recommends the concave face bond foot for aluminum wire applications, and the flat face bond foot for gold wire applications.

GTC Figure 41-7

The concave bond foot is designed to help keep the wire under the foot during bonding. This occurs by creating an inward force component resulting from the concavity as shown above. A control dimension

called the foot length (FL) is used to keep the FR, BL, and BR tolerances from accumulating. Without controlling the FL, this accumulation could result in a longer or shorter than desired wedge bond.

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